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3QuickReferenceGuide32014SteelFurnaceSlagTYPICALAPPLICATIONSAdvantagesoeredbySFSincludetheavailabilityoffreelimewhichhasbeenrecognisedwiththedevelopmentofself-cementingheavydutypavements.UnconnedcompressivestrengthUCS5MPahasbeenachievedat28days.AlsoasatoughdurablematerialSFShasexcellentskidresistancepropertiesmakingitanidealaggregateforpavementsurfacingapplications.ResistancetoruttingmakesSFSparticularlyapplicableforheavilytrackedcornersandstoppingzones.TypicalusesforSFSareSealingasphaltaggregatePavementbaseandsub-baselayersEngineeringconstructionSub-soildrainageThemaintypicalapplicationsfortheuseofSFScomeunderthefollowingspecicationsasshowninTable2belowASPHALTSFShasmanypropertiesthatmakeitsuitableforuseinasphalt.Itisaharddensedurableandwell-shapedaggregatethathasastronganityforbitumen.Theskidresistanceandanti-polishingpropertiesmakeitanidealaggregateforasphaltsurfacingincludingopengradedensegradeandstonemasticasphalt.AsSFSmaycontainsmallamountsofpotentiallyexpansiveproductssuchasburntlimeanddolomitesucientmoistureandtimemustbeprovidedtoenablehydrationofthesematerialstoavoidexpansion.PAVEMENTSENGINEERINGBoundSteelSlagPavementsTheworkingtimeforaboundpavementistypicallythetimemeasuredfromthecommencementofblendingthebindertothematerialtobeboundtothecompletionofthecompactionoftheboundmaterialwithinthepavement.TheuseofmaterialINTRODUCTIONSteelfurnaceslagSFSistheco-productofthebasicoxygensteelmakingprocessBOS.Theslagisremovedfromthevesselaftertheexothermicrenementofmoltenironandrecycledsteelinthepresenceofuxesandoxygen.SFSisaco-productoftheconversionprocessofmoltenirontosteelinabasicoxygensteelmakingwithinanintegratedsteelworks.Achemicalreactionoccurswithinthevesselaftertheoxygenlanceisloweredaprotectiveslaglayerformswiththeadditionoflime.Whenthereactionhasbeencompletedthesteelandslagareseparatedandmoltenslagispouredintopitswheretheslagiscooledwithwaterspraysbeforehaulageforprocessing.SeeAGuidetotheUseofIronandSteelSlaginRoadsforfurtherinformation.TYPICALPHYSICALPROPERTIESSFShasadarkgreycolourwithaparticledensitythatis20greaterthanbasaltandharderthanblastfurnaceslagBFS.Thisproductcrushesintoacubicalshapeandhasthepotentialforexpansionifnotadequatelyweathered.WeatheringistypicallyachievedbyperiodicwateringmonitoringandinternalstockpilemanagementproceduresdevelopedbysuppliersofSFSaggregates.Requirementsforfreelimelimitswhereprovidedshouldbemetbeforesupply.SteelFurnaceSlagQUICKREFERENCEGUIDE3-2014Table2-ApplicableSFSSpecication.RMSVicRoadsSFSTypeR71R73R44R33UnboundBoundSelectFillAggregateTable1-TypicalPhysicalPropertiesofSFS.Notes1OMCdependsonthecomponentsofthemix.2MDDbasedon100standardcompaction.SteelFurnaceSlagTypicalPhysicalProperties-Aggregate1.5-1.8260-300240-2805-152-415-2054-60